Furnace device.



Patented NOV. 21 1911. 2 SHEETS-SHEET 2 viii FIG. 4

H a k RSPKT I v llmmm 'r' mm n. BLAKE mp nann H. rlLAKn,

OF PITTSBURGH, PENNSYLVANIA, ASSIGNORS T BLAKE CBUSHER AND PULVEBIZEBQOMPANY,-OF PITTSBURGH, PENNfiYLVANIA,

. A CORPORATION or PENNSYLVANIA.

' FURNACE DEVICE.

A g Specification of Letters Patent. Patented Hwy, 21, 19111,

'Application and January 31, 191i. Serial no. 665,740.

To olf'whoni may concern:

Be it known thatwe, J OHN E. and

I HENRY H. BLAKE, citizens of the United I proved of Pennsylvania,

States, and residing in the city of Pittsburgh,- in the county ofAllegheny and State ered new and useful Improvements in Fur naoeDevices, of which the following isia specification. v

Our invention consists-in new and immeansfor introducing a supply ofheated air into a furnace or other combustion chamber to promotecombustion of the fuel. The. air. is led-downwardly through.

a heatedqduct or passagein front of the fur nace walland-introduced intothe furnace at the bottom in a highly-heated state. Gontrolling meansareprovided so that the supply of air may be We show novel meansfor-providing access to the interior of the furnace witha slice bar orother tool, when necessary, and

for closing the access orifice when. not in use to exclude the cold airand prevent esc pe of tlie heat. We show a novel closure for suchorifice which consistsof a door hinged to the front of the furnace andcontainin' means for the downward introduction 0 the air, preferablyinthe form of a combined duct and damper member. 7

' scription.

Novel arrangements and. construction of partswill appear from thefollowing de- In 'the o a pract cal tion-aiidiiot intended -to limit thesame to the 'nstructionjshown, Figure 1 is a longitudinal, verticalsection of a furnace'fitted ,with' our invention taken along the line'I--'I in Fig. 2 Fig. 2 is afront elevation of af furnace fittedwiththree of our devices, thedoor of the left hand instalmentbeing 45-shown .open to"disclosethe orifice into the combustionchamber, thedoor-in the central instalment i'ng shown closed. and the'duot memberraised, both: door. and. duct being partially broken. away, whilethedoor in the right hand instalment'is shown closed and the duct memberdepressed, door and duct member being both-partially broken away;

have invented or discovr out off or regulated.

I ingdrawin sfivhichf are howevefl merely. ustrative embodiment of theprinciples of our inven 1 Fig: Bis a horizontal section taken along theline III.-III in Fig. 2.; Fig. 4 is a perspective ofthe plate which weattachto the outside of the furnace wall; Fig. .5 is a similar view ofthe sliding duct member; Fig. '6 is v enrich.

a similar view of the door, while Fig.7 is.

a plan view of the lever mechanism which controls the movement of theduct member.

, The following is a detailed description of the drawings. lis the frontwall of a furnace or'combustion chamber, uporr the outer faceofwhiQ 7 webolt orotherwise secure aplate 2 provided with an inverted T shapedorifice or port 3 which is surrounded on all sides by 1 "arearwardlyextending flange i extending from; the front to the rear face'of wall 1so that when the plate 2 is in place, the orifice 3, which extends intothe interior of the combustion chamberv is walled on alf sides by theflange 4 and the brick work or other.

material of wall l is built up solidly against.

"7 5 fice 3 is intended to permit the introduction the flange 4 tosupport the plate. The oriof a slicelbar or other tool into the furnace,I

when necessary, and the flange iprotects the brick work of'wall 1 frominjury by the tool.

,5is' a doormember, hinged at one side to the plate 2 and provided withinwardly extending flanges at the sides and bottom,-

-6:-6, which serve to space the front of the door away from the plate 2and form therewith an open topped and closed bottom pass'a eway for thedescent of air. r

a is a -port-closing and air-i let controlling member, or duct memberpreferably formed as anelongated tube and provided with lateral flanges8-8 which are mounted in slideways 9-9 on the inner face of door 5 toslidably sup The duct 7 is 0 sufficient width to close the 'verticalportion of orifice 3 and fits closely up against the plate 2 when thedoor 5 is closed. The rear wall of duct 7 is extended laterally at thebottom to form damper'plate' 10- which, when the duct is depressed toits lowest position completely closes the lower portion of orifice 3against the entrance of The duct air into the combustiomchamber. 7israised or lowered bymeans of a conort said duct on said door."

necting rod 11 pivoted to the duct and to a hand lever 12 fulcrumed tothe edge of I would admit cold air into the combustlon door 5; A thumbnut and spring washer, 13, and 13,'respectively, or some other convenient mechanism, is provided so that the lever 12 may be locked in anyposition to hold the duct 7 at any desired elevation.

The upper end of door 5 and of duct 7 may be left open for the naturalentrance of air or may be connected with an air blast device, not shown,for the introduction of air under pressure.

Means are provided, discharging into the top of the furnace, in front ofthe boiler, for supplying liquid or pulverized fuel to thecombustion-chamber; said means comprislng pipes or tubes 14' (onethereof being shown in Fig. 1), which are fully shown and described inour previously-filed, copending application for patent for furnaces,Serial No. 603,100, filed Jan. 17, 1911, and which form no part of thepresent invention.

The operation of our device is as follows. When access with a slice baris desired, the

door 5 is swung open and the orifice 3 is ex-' posed, thus permitting ofconvenient manipulation of the bar. At other times the door 5 is keptclosed against late 2. If no air is to be admitted to t e combustionchamber the duct-7 is depressed to its lowest position, the damper 10shutting the bottom" of orifice 3 and preventing the entrance of airinto the furnace. the device, the duct 7 is raised and locked in itselevated position, whereupon air will enter the top of the duct and thetop of the door at either side of the duct and travel downwardly andenter the combustion chamber-through the bottom of orifice. 3. The airtraveling down the duct 7 -.will be come highly heated owing'tothe factthatthesrear wall of said duct isexposed to the furnace heat through theaperture 3, while down the interior of the heated. The amount of the'air admitted through the orifice 3 at the bottom 'will be regulated bythe elevation of the duct 7 an its integral damper plate 10..

We preferably coat the rear face of door 5 and duct 7 with asbestos orsome other: non-conductor of heat to ing out of the members.

. It is evident that our invention presents a number of noveladvantages, among which may be mentioned the thorough heating of the airbefore its introduction of the same into the combustion chamber, itsintroduc tion at the bottom where it is needed to promote combustion,and the ability of'regulat ing the quantity or cutting oif entire theair admitted. Also the provision of convenient -means for gaining accessto'the com bustion chamber with a slice bar' or other tool withoutinjury to the furnace wall and without requiring an open orifice whichTo admit air through prevent the burnchamber or permit the escape" ofheat therefrom. Thus the furnace room is not unduly heated nor is thereany loss of heat efiiciency. I What we desire to claim is- 1. Infurnace-construction, a plate securable to the exterior wall of afurnace combustion-chamber, and having a port adapted to communicatewith the combustion-chamber, a door carried by said plate, and having afront wall, side walls, an open top and a closed bottom, and disposed infront of said port, and a port-closing and air-inlet controlling memberreciprocable vertically between saiddoor and said plate and spaced fromsaid side walls of the door, leaving an able to the exterior wall of afurnace combustion-chamber, and having a port adapted to communicatewith the combustion-cham- 4 i her, a door carried by said plate, andhaving a front wall, side walls, an open top and a closed bottom, anddisposed in-front of said port, and a port-closing and air-inletcontrolling member disposed between said door and said plate andslidable vertically in bearings carried by said door, and spaced fromsaid side walls of the "door, leaving an air-passage oneach side ofgsaidmember between it and the adjacent side wall of said door, said memberin its lowermost position entirely closing-passage through said port.

3. In furnace-construction, a plate securable to the exterior wall of afurnace combustion-chamber, and having a port adapted.

to communicate with the combustion-chamber, a door carried by saidplate, and having a front wall, side walls, an open top and a closedbottom, and. disposed in front of said port, a port closing and airinlet controlling member reciprocable vertically between said'door andsaid plate and spaced from said side-walls of the door, leaving anair-passage on each side of said member between it and the adjacent sidewall of said door, said member in its lowermost position entirelyclosing passage through said port,

and manually-operable means connected with said member for controllingthe movement thereof. I

4. In furnace-construction, a plate securable to the exterior wall of afurnace combustion-chamber, and having an inverted, T-shaped portadapted-to communicate with the combustion-chamber, a door carried bysaid plate, and having a front wall, side walls, an open top and aclosed bottom, and disposed in front of said port, and a portclosing andair-inlet controlling member reciprocable vertically between said doorand said plate and spaced from said side walls of front wall, sidewalls, an open top and a closed bottom, and disposed front of said port,and a port-closing and air-inlet controlling member reciprocablevertically 15 between-said door and sa1d plate and spaced from said sidewalls of the door, leaving an air-passage on each side of said member between it and the adjacent side wall of said door, said member in itslowermost position 20 entirely closing passage through sa1d port.

JOHN E. BLAKE.

HENRY H. B.

- Witnesses:

T. Grmmmns DUFF, L

EDWARD A. LAWRENCE.

